feat(store): added postgres index for owner columns

[lukidzi]

Checklist prior to review

When removing Mesh we are removing all resources in cascade. We have a foreign_key which uses owner_type, owner_mesh, owner_name. When mesh is removed all the resources are removed in a cascade mode. The issue is that when cascade remove is triggered we are iterating over the table without indexing. Fields referenced by the foreign_key are not indexed that why the operation is slow.

• Link to relevant issue as well as docs and UI issues --
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as a image registry) and it will work on Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Tests (Unit test, E2E tests, manual test on universal and k8s) --
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? (this GH action will add "backport" label based on these file globs, if you want to prevent it from adding the "backport" label use no-backport-autolabel label) --
• Do you need to explicitly set a > Changelog: entry here or add a ci/ label to run fewer/more tests?

[bartsmykla]

Just to demonstrate the improvement.
Was before:

Is now: